Task 2 Tomographic Reconstruction

We are confident that the IR-HeNe laser can be used to rapidly determine (within say ten seconds) the mean concentration of fuel at, for example, the entire exit of a premixer; by using tomographic reconstruction. This is not new. However, what has not been reported, but should be feasible, is to use tomographic reconstruction for determination, spatially resolved, of the RMS of fuel concentration at, for example, the entire exit of a premixer. The assumption of axisymmetry would not be needed.

Status: Work is currently underway to adapt a genetic algorithm program to calculate concentration profiles and concentration rms profiles of a coannular pipe flow from line of sight measurements at multiple angles. Results of this work have been reported in a paper submitted to the 29th International Symposium on Combustion to be held in Sapporo, Japan, July 21-26, 2002. This paper, giving details about the tomographic reconstruction and the LES results, is attached as Appendix A.

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